I'm working on a set of choropleth maps for planning project areas. We're discussing whether it's better to create maps with percentages of total population or to show density (normalized by acre of census tract) of percentage of population. The maps are just to show where the planned project areas in relation to areas below poverty, etc. are. So is it better or more of a standard just to show where percentages of population demographics are or would it be better to show the density of those areas?